math class in java

public class mathclass{
public static void main(String[] args){
//E and round()
Double a = Math.E;
System.out.println("e = " + Math.round(a*100)/100f);
//PI
System.out.println("pi = " + Math.round(Math.PI*100)/100f);
//abs()
System.out.println("Absolute number = " + Math.abs(Math.PI));
//ceil()
System.out.println("Smallest integer value but greater than the argument = " + Math.ceil(Math.PI));
//exp()
System.out.println("Exponent number powered by the argument = " + Math.exp(0));
//floor()
System.out.println("Largest integer value but less than the argument = " + Math.floor(Math.E));
//IEEEremainder()
System.out.println("Remainder = " + Math.IEEEremainder(5.3f,2.2f));
//max()
System.out.println("Maximum Number = " + Math.max(10,10.3));
//min()
System.out.println("Minimum Number = " + Math.min(10,10.3));
//pow()
System.out.println("Power = " + Math.pow(10,3));
//random()
System.out.println("Random Number = " + Math.random());
//rint()
System.out.println("Closest to the Argument = " + Math.rint(30));
//round()
System.out.println("Round = " + Math.round(Math.E));
//sqrt()
System.out.println("Square Root = " + Math.sqrt(400));
}
}